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Coastal Plain Rock Type: Sedimentary Layered by sediments left when area was flooded & by sediments eroded from Appalachian Mtns transgression: when sea level rises & floods the land regression: when sea level drops, exposing the land All sedimentary rocks at surface Many oceanic fossils Oblique aerial view of Passmore Creek and marsh, Jamestown Island, James City County

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Coastal Plain Structure Fairly low-relief, but dips slightly toward ocean Geologic Age Youngest of VA provinces Started forming when Atlantic Ocean opened in late Triassic

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Coastal Plain – Chesapeake Bay The Chesapeake Bay was created about 5000 to 6000 years ago when the area was flooded as meltwater from glaciers raised sea level. Continuing sea level rise and shoreline erosion caused the bay to grow further.